Frame Building 101- A Basic Jig

progress at last.. machined some parts in college, im quite please as they are within a reasonable tolerance and should build a straight jig. still need about the same again of machined parts and then some extruded alumium.

i also finished building a balance bike for my daughter, it now also has bartape and a bell.

bar stem combo

Wow! Bravo!

merci

nice one jim
love the balance bike

Nice one! Love a fillet-brazed balance bike. Not for me obviously. I'm too tall.

Where did you source the wheels for he balance bike? When I finally get round to starting welding (need to clear some garage space) I plan to make a couple of balance bikes but sourcing wheels seems to be difficult.

Got them on ebay from some company in germany they weren't cheap at about £40 without tyres or tubes.

Progress

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close up

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machined up the seat tube / bottom bracket assembly today. cant wait to get it finished.

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Great read, jimjam. Will be keeping an eye on this. Wold love to build a frame on my own one day.

http://www.ebay.co.uk/itm/Silverfox-Raven-kids-bike-14-/331439288051?pt=UK_Bikes_GL&hash=item4d2b522ef3

Take the wheels off this, and some extras.
I live in Brighton so if you win it I can pick it up for you and bring it to london (I work in central)

EDIT: There's no need for me to be so kind. There's dirt cheap kids bike on ebay based in london. Good idea though and you can use the chains, bars, and seatposts.

just finished it. well almost still need to check alingment fully and build a rotating mount for it. i will upload some better photos when i get a chance. guess i need to build some frames.

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Great stuff. jealous of your surface table!

access to back of tubes ok?

access is fine, tubes sit 140mm from the main beam. jig will be solely used for tacking frame prior to welding/brazing in a workstand. the fact it will rotate also gives lots of options when it comes to access.

some close ups, there was a ton of machining involved but im really happy the way its turned out.

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Ah yes, can see now!

Looks brilliant.

Lovely, well done.

i don't know what they are made of on "OTP" jigs, but when i had alloy cones to support the tubes they sucked all the heat from the torch making brazing impossible.. couldn't heat the surface properly

hma i hope thats not the case here, my lathe will take forever to make them in stainless